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Historical Development of the Atom

By miar20
  • 400 BCE

    Democritus

    Democritus
    Established the concept that everything the the universe consisted of atoms.

  • John Dalton

    John Dalton
    His modern atomic theory is still relevant within our society today. It proposes that all matter consists of atoms. Futhermore, it states that compounds are formed by a combonation of two or more different atoms, and atoms themselves are unable to be destroyed.

  • Mendeleev

    Mendeleev
    Published the first periodic table.

  • J.J Thomson

    J.J Thomson
    Thomson discovered electrons, and the postive and negative charges of protons and electrons respectivally. Futhermore, he developed the Plum Pudding atomic model prior to Rutherford's discovery of the nucleus.

  • Henry Moseley

    Henry Moseley
    Moseley created a more accurate organisation of the period table through the inclusion of atomic mass.

  • Sir William Ramsay

    Sir William Ramsay
    Discovered the gases neon, argon, krypton and xenon. Furthermore, he showed that helium and radon create a new group of gases called the Noble Gases.

  • Ernest Rutherford

    Ernest Rutherford
    Developed the gold foil experiment, and through this established that the atom contained a relitavley heavy centre, soon to be known as the nucleus, through shooting partciles at gold foil.

  • Niels Bohr

    Niels Bohr
    Proposed the theory of the hydrogen atom, and created the model used within modern soceity, known as the Bohr Model. He also discovered electrons circulate the nucleus and detirmine the features of an element.